From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BF90BC43458 for ; Sun, 12 Jul 2026 16:54:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9D4F76B008A; Sun, 12 Jul 2026 12:54:31 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 985E46B008C; Sun, 12 Jul 2026 12:54:31 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 873CA6B0092; Sun, 12 Jul 2026 12:54:31 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 57C386B008A for ; Sun, 12 Jul 2026 12:54:31 -0400 (EDT) Received: from smtpin22.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay02.hostedemail.com (Postfix) with ESMTP id BDB0C12099E for ; Sun, 12 Jul 2026 16:54:30 +0000 (UTC) X-FDA: 84980723100.22.FF2A863 Received: from mail.alien8.de (mail.alien8.de [65.109.113.108]) by imf06.hostedemail.com (Postfix) with ESMTP id 65F9D180004 for ; Sun, 12 Jul 2026 16:54:28 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=alien8.de header.s=alien8 header.b=hZd3B02y; spf=pass (imf06.hostedemail.com: domain of bp@alien8.de designates 65.109.113.108 as permitted sender) smtp.mailfrom=bp@alien8.de; dmarc=pass (policy=none) header.from=alien8.de ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1783875269; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=y0mSGKSljGbp3wm1OkPuo0d6XMXK1FIsRCwQHXpgKVI=; b=zFKUrYlMt51ZB42+rwN/bpiWKeOcNCluE3/hQyTNkr0/IJE50ubMxwoxmF3p8f02/v61zu v1X4lExIOvv5rsG8xmrZQq1T5w6jMCEcOKN6d3RwgKrhTCxL5tjHF5WAP/CIoogjayrqaD z9JW7urvkAkxIt003yrIEXSieuoPOGo= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=alien8.de header.s=alien8 header.b=hZd3B02y; spf=pass (imf06.hostedemail.com: domain of bp@alien8.de designates 65.109.113.108 as permitted sender) smtp.mailfrom=bp@alien8.de; dmarc=pass (policy=none) header.from=alien8.de ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1783875269; b=n1TFBEkvduOtGjJsQSku6xB/2/pk5KR3AdVSgl9SWYIfHJuWlhLEAcMdpxwoJNN15VqdS5 QZFSjbeCxOklSASs3w+Td8uYSx1lAwfxMpGtIRJxeC3bEpyS0Nt1g1Ozr/rs5wgl/r+vqn XUVn7GHL7EMvaiUE0YNJdUv7s66MOqk= Received: from localhost (localhost.localdomain [127.0.0.1]) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTP id 0C99240E029F; Sun, 12 Jul 2026 16:54:25 +0000 (UTC) X-Virus-Scanned: Debian amavisd-new at mail.alien8.de Received: from mail.alien8.de ([127.0.0.1]) by localhost (mail.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id srior6ed563w; Sun, 12 Jul 2026 16:54:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=alien8; t=1783875255; bh=y0mSGKSljGbp3wm1OkPuo0d6XMXK1FIsRCwQHXpgKVI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=hZd3B02yURgxnaN2bOuG5eS5BGaZkYAs2AweWjgF8MPvxxPq1Pt2vhEEqnCqz6wWA 8dNkaOdtd19u+IcSBM/HjAx7JcHZLN7A5upeotFOjvVZJuJPXZ2xLlJORfsSwePPkj s2QScnUZnorDzAAJHT7r+lAsUwSUICK0TK1gzPA+4BNove0iPem796CCGh6+vQ2uTF IaaWP96Soy2OIRtZQ4wj3sYYMzUU7eb9vJwS5dkoeTmPjJv/vViw09zNDbqo+F8B9q AyltvY6d3w6OaBCUM9eOqQsnsnrBBcZmFjmra1vn3CEnFOv/wKIU6VNf/oyr4hwPGu 7M7+2UxNFU+pg0Lto33EIt9lKX7i+Z29412SELwxHS1ldaxuC8r38fIiiBJ/60gssa pi0hvyvsYutR7Ji2QjYroHz3Tz4NoMG/Ar3Egs6W/tT79qOi1QngXwmUMBYQyqPoUH Ruz1xqCCFqxR3bLPqeiF9m4mB9wan85MmnjIRAYyecU6ELmJSYolJcfG5wxdEz+Bdf GsCumXAiqGmZg2okklasr3ESHBzuoOl7c9q1iHAJ7QaMfNvEci61R9mQ2/96kYvjQ6 X2EbOcc7yHrtpWfN6qHdZShRWsJAMFRBQB9QrCT/E+9KlUi/jyYAcpQpaMbn/8DBjw Da+sRgL8/If7qfYW8RZJTeHc= Received: from stx.tnic (unknown [IPv6:2600:1700:38ca:c00::3a]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature ECDSA (P-256) server-digest SHA256) (No client certificate requested) by mail.alien8.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 22D5740E00C3; Sun, 12 Jul 2026 16:53:45 +0000 (UTC) Date: Sun, 12 Jul 2026 09:53:41 -0700 From: Borislav Petkov To: Lorenzo Stoakes Cc: Andrew Morton , Suren Baghdasaryan , "Liam R. Howlett" , Vlastimil Babka , Shakeel Butt , David Hildenbrand , Mike Rapoport , Michal Hocko , Uladzislau Rezki , Toshi Kani , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , x86@kernel.org, "H. Peter Anvin" , Kiryl Shutsemau , Catalin Marinas , Will Deacon , Dev Jain , Ryan Roberts , David Carlier , linux-mm@kvack.org, linux-kernel@vger.kernel.org, bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org Subject: Re: [PATCH mm-hotfixes v2 2/4] x86/mm/pat: acquire mmap lock on page table free to avoid ptdump UAF Message-ID: <20260712165341.GAalPGldsKpBs5treJ@fat_crate.local> References: <20260712-series-vmap-race-fix-v2-0-ad134cc3a12a@kernel.org> <20260712-series-vmap-race-fix-v2-2-ad134cc3a12a@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260712-series-vmap-race-fix-v2-2-ad134cc3a12a@kernel.org> X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 65F9D180004 X-Stat-Signature: rtf4pu99ejbeptbkqxpbs3uw4ixtffy9 X-HE-Tag: 1783875268-727341 X-HE-Meta: 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 ud6qU4ax KBEs/E8Ad0jY+p+FnAUVVDXHqZhT6XJ35vInPvbJ5eF7rv18yvOoQcAXA80GaeFx3mMnZ+YE7AAdJ0sqzBuIqO9eY7P0d6Q7GIekr+bOyKsk5Ot3SXacYfpNzVwhVFv9gAB3iH727ipuI8HEN8lVEQQhwxi864MAhKmdbgTbgOi4XCASAeI29YfPyCPcSmmYwHKCX1FhzrCjQCr4dXCuSQIvgKtz3u2wTFIJOJElwjHiPot6c17a+AsuVDcuHGH1oKt84GKN3l20nJZqhVKJ+k/m6ZCJ8HSKUbuAtePT9yDEpW8s= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sun, Jul 12, 2026 at 11:42:25AM +0100, Lorenzo Stoakes wrote: > This patch resolves the issue by acquiring the mmap read lock on init_mm to s/This patch resolves/Resolve/ > provide mutual exclusion against ptdump, which acquires the init_mm write > lock. ... > We also include cleanup.h in order to use a scoped_guard() to implement > this cleanly. You don't need to explain that. Thx. -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette